Testing the Distance-Duality Relation in the $R_h=ct$ Universe

TL;DR

This study tests the cosmic distance duality relation using supernovae and galaxy cluster data within the $R_h=ct$ and $Lambda$CDM models, finding the relation holds at 2-3 sigma and favoring $Lambda$CDM.

Contribution

It provides a simultaneous constraint on the CDD relation and supernova light-curve parameters within two cosmological models, comparing their consistency with observational data.

Findings

The CDD relation is valid at 2$sigma$ for $H_0=67.8$ km/s/Mpc.

The CDD relation is valid at 3$sigma$ for $H_0=73.45$ km/s/Mpc.

The $Lambda$CDM model is strongly preferred over the $R_h=ct$ model based on AIC and BIC.

Abstract

In this paper, we test the cosmic distance duality (CDD) relation using the luminosity distances from joint light-curve analysis (JLA) type Ia supernovae (SNe Ia) sample and angular diameter distance sample from galaxy clusters. The $R_h=ct$ and $\Lambda$CDM models are considered. In order to compare the two models, we constrain the CCD relation and the SNe Ia light-curve parameters simultaneously. Considering the effects of Hubble constant, we find that $\eta\equiv D_A(1+z)^2/D_L=1$ is valid at the 2$\sigma$ confidence level in both models with $H_0 = 67.8\pm0.9$ km/s/Mpc. However, the CDD relation is valid at 3$\sigma$ confidence level with $H_0 = 73.45\pm1.66$ km/s/Mpc. Using the Akaike Information Criterion (AIC) and the Bayesian Information Criterion (BIC), we find that the $\Lambda$CDM model is very strongly preferred over the $R_h=ct$ model with these data sets for the CDD relation test.